Richard s



(No Model.) 2 Sheets-Sheet 2.

R. s. GILLESPIE.l

STOP VALVE.

No. 408,706.- Patented Aug. 13, 1889.

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RICHARD s'. GILLEsPIE, on HAMILTON, BERMUDA.

STOP-VALVE.

SPECIFICATION forming part of Letters Patent No. 408,706, dated August 13, 1889. Application filed April 29, 1889. Serial No.309,034. (No model.)

To all whom t may concern.-

Be it known that I, RICHARD S. GILLEsrIE, a citizen of the United States, formerly of New York city, in the State of New York, at

present residing at Hamilton, in the Island of Bermuda, have invented a certain new and useful Improvement in Stop-Valves, of which the following is a specification.

Myimproved valve is intended more espeeially for controlling the flow of steam in large pipes under a high pressure, and it will be described as thus applied; but it may be used with -smaller pressures and to control other fiuids, as water in water-mains in streets and gas in gas-mains, and also on the same or a smaller scale forvarious other iiuids in any situation.

My valve is a straight-way valve, allowing the steam to flow through Without change of direction when fully open. It is of that class in which the closing is effected by two disks which are brought into position and pressed, respectively, in opposite directions against two seats, one closing the passage through which the steam is received Vand the other closing the passage through which the steam is delivered. The disks are operated through the medium of a carriage, which, actuated by eiiicient means for moving it, carries the disks into the proper position for closing or draws them out of it, as required. Independentlyoperated means are provided for forcing the disks strongly against their seats when fully in position and for relaxing their pressure against the seats when the carriage is to be withdrawn, carrying the disks withit. The strong pressure of the disks against their seats is induced with little resistance, and the seats are formed by bushings of brass or analogous material expanded into place,which bushings perform, also, an important function in receiving the pipes and insuring that the pipes may be easily removed when required at any time.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention.

Figure lis a central vertical section, and Fig. 2 -is a vertical section of a portion at right angles to the section in Fig. l. The remaining figures show modifications. All are central vertical sections. Fig. 3 shows the disks expanded by elevating rather than depressing the internal spindle. Figs. 4 and 5 expand by depressing, but show modifications in the mode of operating.

Similar letters of reference indicate corresponding parts in all the figures Where they occur.

Referring to Figs. l land 2, A is a casing, of cast iron or other suitable material, equipped with a removable head or top A. The carriage with its operating means and the disk with the provisions for independently forcing them apart at will are all mounted in this removable head and are introduced and removed therewith.

B B are the pipes which bring and convey away the steam. My valve controls it equally, Whether the pressure is in one direction or the other, constantly or intermittently.

B B are bushings of brass or other suitable incorrodible and slightly-yielding material. They are expanded into seats in the proper nozzles cast on the casing A, the seats being' previously grooved, as indicated by a. The distending of the soft bushings B B may be effected by a tube-expander, and should be sufficiently forcible to distend the metal tightly into these grooves a, and therebylock thebushings permanently and strongly in place. A portion of the inner face of each bushing is tapped to receive the corresponding pipes B B. The proper end of each bushing is finished plane and smooth to form` the seat for the disk.-

D is the carriage arranged to move u p and down in the recess provided in the top A. Its lower portion engages, as shown, with stout pins E, formed on the backs of the respective disks E E. When the carriage is raised and lowered, it carries the disks with it. A sufficient space is provided in the upper portion of the casing A and in the base of the head A to allow the carriage to rise, so as to move the disks entirely out of the steamway.

G is a hand-wheel fixed on a sleeve G, which is capable of turning, but not of moving up 4and down. It is provided With an internal screw-thread g, matching a correspond IOO ing screw-thread formed on the carriage D. The sleeve has a collar G2, which is held in the bottom of the stuffing-box. There may be a metallic washer II over this collar to form a bearing, or it may be pressed on directly by the under face of the packing I, as may be preferred. This collar constitutes a reliable abutment by which the internal threads g can act on the carriage to raise or lower it.

To set the valve wide open, the pressure of the disks against their seats being previously relaxed, it is only necessary to turn thehandwheel G and raise the carriage, carrying the disks with it, out of the current and allowing the steam to flow straight through unobstructedly from one pipe B to the other. To partially close the valve, it is only necessary to turn the hand-wheel G in the opposite direction, and by the proper action of the screw to depress the carriage and .its attached disks to therequired partial extent, so as to obstruct the i sage and retard the flow of the steam.

Vhen it is required to close the valve entirely, it is important not only to depress the carriage D, with its attached disks, to the fullest extent, but also to urge the disks forcibly apart. This latter is effected by a rod J, tapped into the carriage, and having a hand-wheel J a screw-threaded portion j, and a tapered portion J 2. Then the earriage is fully depressed, the operator lets go of the hand-wheel G by which he has been depressing the carriage, and takes hold of the hand-wheel J and giving it a few turns depresses the rod J still farther, and by the wedge-like action of its tapered portion J2 forces the disks E strongly against their respective seats. lVhen the valve is to be opened, the attendant first turns the handwhcel J and raises the tapering rod J, thus relaxing the pressure on the disks E E and allowing the disks to relax the pressure of their faces against their respective seats. Ihen this is sufficiently done, the operator takes hold of the wheel G, and by turning it operates thel sleeve G, and by means of its screw-thread g raises the carriage D, with its connected disks E, into the space provided in the upper portion of the casing.

The disks E are each cast with teeth, which engage with the teeth of a corresponding vertical rack A2 in the valve-casing. The effect is to revolve the disks on their central pivots E as they are raised and lowered.

I consider the rotating motion of the valvedisks important, for as the valve-disks rub against their seats the motion will wipe off any deposit that may collect on either.

Modifications may be lnade without departing from the principle or sacrificing the advantages of the invention.

In Fig. 3 the taper on the rod corresponding to the rod J is reversed and the rod remains down.

In Fig. 4t the working-screw is outside of the casing and carries the expanding mandrel, carriage, and valves up and down by the arm shown. The screw-threads on mandrel or central stem are of different diameters, but the same pitch, and consequently cannot jam as this mandrel is raised and lowered.

I have shown the seats A3 as standing atl a slight inclination. Such inclination facilitates the tightening of the contact with their respective seats when the disks are depressed and the relaxing of such contact when the disks are elevated. The inclination of the disks may be increased or diminished. It is important not to incline these parts so much as to interfere with the proper and continuous engagement of the toothed edge of cach disk with the proper rack.

Parts of the invention can be used without the whole.

In Fig; 5 the inclination of the seat-s and of the disks is greater than in Figs. 1 and 2. In this modification there is an appreciable inclination to the valve-seats and to the disks when they are in the closed position. I prefer the whole, as shown in Figs. 1 and 2.

In large valves the stuffing-box around the central spindle may be omitted, because that portion of the screw that the central spindle passes through is of a length some ten times the diameter of the central spindle, and when accurately fitted the close contact of the parts for so long a distance prevents any leakage of steam or other fiuid under all practicable pressures, even up to one thousand pounds per square inch.

I do not claim, broadly, the bushings B', engaged with the cast metal A by being expanded into the groove d, allowing the pipes B B to be each connected with the easing A and disconnected at will. Such bushings as relate to the casing and pipes alone are made the subject of a separate application for Letters Patent filed December 10, 1888, Serial No. 293,187.

I claim as my invention- 1. In a valve, the casing A, carriage D, and disks E, carried by the carriage, but free to move apart and together, in combination with each other and with the separately-operated screw J, provided with a tapering portion J 2, arranged to force the disks apart or to relax such force, all substantially as herein specified.

2. In a valve having a carriage D, with disks E, carried thereby, but capable of movement apart and together, and also of revolving on their axes, the tapering rod J, screwthreaded at j, and means J for turning it at will, in combination with each other and with the racks A2, arranged to revolve the disks as they are raised and lowered, all substantially as herein specified.

3. In a valve having a carriage D, with vdisks E, carried thereby, and means, as the screw-threaded tapering rod J J 2j and handwheel J', for forcing the disks apart and relaxing' the force at will, the bushings B', of

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yielding and ineorrodible material, arranged August, 1888, in the presence of two subscribto serve the double function of seats for the ing Witnesses. disks and of an inoorrodible connection between the easing A and the pipes B, as here- RICHARD s' GILLESPIE' 5 in specified.. Witnesses:

In testimony whereof I have hereunto set H. A. JOHNSTONE,

.my hand, at New York city, this 30th day of M. F. BOYLE. 

